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October Weather in Unalaska, United States

Last updated: June 24, 2025

In October, the average temperature in Unalaska, United States is a brisk 5°C (42°F). Be prepared for fluctuations, as temperatures can dip to a minimum of -3°C (27°F) and reach a maximum of 12°C (54°F). This month sees 147 mm (5.8 in) of precipitation spread over 20 days, contributing to a notably high average humidity of 82%.

October Temperature in Unalaska

In October in Unalaska, the average temperature is 5°C (42°F). Maximums can reach 12°C (54°F), while minimums can drop to as low as -3°C (27°F). Be sure to pack warm clothing if you plan to travel during this time.

October Weather in Unalaska: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Unalaska, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unalaska, October typically has an average temperature of 5°C (42°F), with highs reaching up to 12°C (54°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec303332354045505147423632
Data source: Temperature data for Unalaska generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Unalaska

In Unalaska in October, the total precipitation amount is 147 mm (5.8 in) spread over a duration of 20 days.

October Precipitation Trends in Unalaska

The chart displays monthly precipitation patterns in Unalaska, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Unalaska, October typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec9515792991151006589117147113157
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Unalaska

In Unalaska in October humidity is 82%. With an average temperature of 5°C (42°F), this humidity feels like a wet chill that seeps into your bones, making outdoor exploration uncomfortable and dampening the joy of traveling.

October Average Humidity in Unalaska

This chart illustrates the average monthly humidity levels in Unalaska, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Unalaska is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%84%83%84%90%93%95%92%86%82%81%83%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Unalaska

In Unalaska in October, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Unalaska, you can check the information here.

Maximum UV Index Levels in Unalaska for October

The chart shows the monthly maximum UV Index (UVI) for Unalaska in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Unalaska typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123567885321
Data source: Unalaska October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How October Weather in Unalaska Compares to Other Months

Weather in Unalaska varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Unalaska, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Unalaska, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)95 mm (3.8 inches)83%low
February Weather1°C (33°F)157 mm (6.2 inches)84%low
March Weather0°C (32°F)92 mm (3.6 inches)83%moderate
April Weather2°C (35°F)99 mm (3.9 inches)84%moderate
May Weather4°C (40°F)115 mm (4.5 inches)90%high
June Weather7°C (46°F)100 mm (3.9 inches)93%high
July Weather10°C (50°F)65 mm (2.6 inches)95%very high
August Weather11°C (51°F)89 mm (3.5 inches)92%very high
September Weather9°C (48°F)117 mm (4.6 inches)86%moderate
October Weather5°C (42°F)147 mm (5.8 inches)82%moderate
November Weather2°C (37°F)113 mm (4.5 inches)81%low
December Weather0°C (32°F)157 mm (6.2 inches)82%low

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